Should you be able to sell human organs? Child pornography? If you agree to let someone pay your family and kill you, should they be chargeable with murder? Th

Should you be able to sell human organs? Child pornography? If you agree to let someone pay your family and kill you, should they be chargeable with murder? These are all voluntary business relationships. They're illegal because society has mostly agreed that there should be a limit to how much a transaction can extract from someone. That people, even at their most desperate, should still be protected. And yes, the bounds here can be arbitrary. Selling organs is illegal while selling sperm and eggs is not. But ultimately, most everyone agrees that we should draw the line somewhere. The entire point of a society is a set of norms around how to interact with others.